Question

3x + y = 1

y = 6 - 4x

A: -x + 6 = 1
B: x + 6 = 1
C: 7x + 6 = 1

Answer 1

x = 5

Answer 2

so your answer is A because if you put 5 into the equation where x is, it works

-5+6=1
true statement